从提钒尾液制备磷酸锰铁锂正极材料的研究
Preparation of lithium manganese iron phosphate cathode material from vanadium tailings
李智宇 1汤婷 1王正豪 2陈良 1朱英明 3吴可荆 3罗冬梅1
作者信息
- 1. 四川大学化学工程学院,四川 成都 610065
- 2. 中南大学冶金与环境学院,湖南 长沙 410083
- 3. 四川大学新能源与低碳技术研究院,四川 成都 610065
- 折叠
摘要
以钒渣提钒过程中产生的富含铁锰的浸出液为原料,通过共沉淀法制备了二水草酸铁锰Mn0.5Fe0.5C2O4∙2H2O,以此为前驱体,通过高温固相法成功合成了磷酸锰铁锂LiFe0.5Mn0.5PO4 正极材料,实现了钒渣浸出液中铁锰资源的综合利用.结果表明,在初始pH值为 3.5,温度 25℃,反应时间 90 min,草酸铵加料量为理论值的 1.1倍,加料方式为正加的条件下,铁和锰的沉淀率分别为 99.5%和 99.4%,与其他杂质实现深度分离,Mn0.5Fe0.5C2O4·2H2O的纯度达 99.97%,且粒径较小,分散性良好.可将其作为合成磷酸锰铁锂正极材料的前驱体,为磷酸锰铁锂的工业化生产提供了思路.
Abstract
Using the iron-manganese-rich leaching solution generated during vanadium extraction from vanadium slag was used as the raw material,and ferromanganese oxalate dihydrate Mn0.5Fe0.5C2O4∙2H2O was prepared by co-precipitation,and lithium ferromanganese iron phosphate LiFe0.5Mn0.5PO4 anode material was successfully synthesized by the high-temperature solid-phase method using this precursor,which achieved the comprehensive utilization of the iron-manganese resources in the vanadium slag leaching solution.The results showed that under the conditions of initial pH 3.5,temperature 25℃,re-action time 90 min,ammonium oxalate addition 1.1 times of the theoretical value,and the addition mode of positive addition,the precipitation efficiency of Fe and Mn were 99.5%and 99.4%,respect-ively.The depth separation from other impurities was achieved,and the purity of Mn0.5Fe0.5C2O4·2H2O reached 99.97%with small particle sizes and good dispersion.It can be used as a precursor for synthes-izing lithium manganese iron phosphate cathode materials,which provides the idea for the industrial production of lithium iron manganese phosphate.
关键词
钒渣浸出液/共沉淀法/草酸铁锰/磷酸锰铁锂Key words
vanadium slag leaching solution/co-precipitation/ferromanganese oxalate/lithium ferro-manganese phosphate引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据